Forum > GPU crunching
AMD 12.1 previe driver performance
Raistmer:
Or just weird driver behavior when it gives different results from restort to restart...
On this picture one of those 2 tasks finished (small drop). Another task started but no corresponding increase in GPU usage.
Then second task finished - great GPU usage drop, almost to zero (though 1 task still running!) and then, when both new tasks are past of initialization stage, GPU usage remains unacceptable low...
skildude:
Have you tried running 3 WU's at a time. See if that boosts the numbers. I'm still getting a high GPU usage from mine
Claggy:
Here's an example of one of my slow running ATI_r521 AP tasks with Cat 11.12:
http://setiathome.berkeley.edu/result.php?resultid=2235201318
I've also had it with Cat 11.5 on the same host,
Strangely when the HD5770 was fitted to the E8500 and that had Cat 11.5 installed, i never saw any slowdowns, and didn't need to use the -hp switch eithier.
Claggy
Mike:
I´ve noticed this also on my host with 11.5. on my driver test back in june.
Raistmer:
Well, in existing apps I relied on OS/driver to cleanup GPU state when process terminated.
It's possible that new AMD drivers can't cleanup properly and need help from application.
So I will not go further in optimization and implement full OpenCL objects cleanup inside app instead. Maybe this could help with this issue.
BTW, OpenCL 1.2 is really breakthrough. It should fully support devicesplitting.
For example one can use full GPU when there are enough workitems and use only poart of GPU where too few workitems available (and we have this case in Pulse finding in VLAR for example).
Hope HD69xx will be compatible with OpenCL 1.2 too, not only HD7xxx ...
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